Answer:
x = -2
y = 3
Step-by-step explanation:
Since y = 3x +9, substitute this value in the first eq.
4x + 5(3x+9) = 7 ===> 4x + 15x + 45 = 7 ===> 19x = 7-45 ==> 19x = -38 ===>
===> x -38/19 ===> x = -2
Replace this value in the second eq.
y = 3(-2) + 9 ===> y = -6 + 9 ===> y = 3
